Yoke and manufacturing method thereof

Inactive Publication Date: 2007-11-15
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention is conceived to solve the aforementioned problems in the related art. An object of the present invention is to minimize a length change between a base material state and a completed state when forming an inner yoke portion of a yoke.

Problems solved by technology

However, the aforementioned related art has the following problems.
However, if the drawing process is carried out once in order to obtain the designed value of the inner yoke portion, the inner yoke portions may be ruptured or not be formed in a precise size.
Accordingly, it is difficult to form the inner yoke portion and the base portion adjacent thereto to have the size and shape according to the design.
Particularly, since the designed value of the inner yoke portion is at least twice as large as the length in the base material state before the drawing process, it is difficult to control the size of the inner yoke portion due to a crack or rupture.
In addition, as the size of the center vent is limited, the increase of the length of the inner yoke portion is restricted.
Therefore, it is very cumbersome to perform a process of attaching a reflecting plate for measuring a tracking property of the bobbin in the actuator to an objective lens of the bobbin through the inner yoke portions.

Method used

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  • Yoke and manufacturing method thereof
  • Yoke and manufacturing method thereof
  • Yoke and manufacturing method thereof

Examples

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Embodiment Construction

[0021] Hereinafter, an exemplary embodiment of a yoke and a manufacturing method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

[0022] Referring to FIGS. 1 and 2, a yoke 20 of an exemplary embodiment according to the present invention is made of a metallic material. For example, the yoke 20 is manufactured by pressing a metal plate. The yoke 20 includes a base 22. The base 22 is formed in the shape of a generally quadrangular plate. A center vent 24 is formed in a quadrangular shape at a center portion of the base 22. Inner yoke portions 26 are formed upright on the base 22 at opposite edges of the center vent 24.

[0023] The inner yoke portions 26 define a path of magnetic flux for operation of an actuator, thereby making it possible to constitute a closed circuit of a magnetic field. In addition, support protrusions 27 are formed to protrude at the leading ends of the inner yoke portions 26, respectively. The supp...

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Abstract

A yoke, as embodied, includes a base having a center vent; at least a pair of inner yoke portions respectively located at both end edges of the center vent and protruding from the base to face each other, each of the inner yoke portions having a support protrusion, the support protrusions being respectively located at complementary positions of leading ends of the inner yoke portions; and at least a pair of outer yoke portions protruding from the base and facing each other.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This Nonprovisional application claims priority under 35 U.S.C. §119(a) on patent application Ser. No. 10-2006-0038929 filed in Korea on Apr. 28, 2006, the entire contents of which are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a yoke and a manufacturing method thereof, and more particularly, to a yoke which can define a magnetic path in an actuator, and a manufacturing method thereof. [0004] 2. Description of the Related Art [0005] A yoke, which is made of a metallic material, is generally manufactured by pressing a metal plate. In more detail, the yoke is consecutively manufactured in a progressive mold. That is, the yoke is formed in a designed shape by passing a base material elongated in a band shape through the progressive mold and sequentially processing the base material. In a process of forming inner yoke portions, the inner yoke portion...

Claims

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Application Information

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IPC IPC(8): H02K41/00H02K15/00G02B7/02
CPCH02K15/02Y10T29/49009H02K41/0356G11B7/08G11B7/085G11B7/09
InventorSONG, CHANG YEOL
OwnerLG ELECTRONICS INC